US8720789B2 - Wireless IC device - Google Patents

Wireless IC device Download PDF

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Publication number
US8720789B2
US8720789B2 US14011823 US201314011823A US8720789B2 US 8720789 B2 US8720789 B2 US 8720789B2 US 14011823 US14011823 US 14011823 US 201314011823 A US201314011823 A US 201314011823A US 8720789 B2 US8720789 B2 US 8720789B2
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wireless ic
element
ic device
coil
device according
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US20130341415A1 (en )
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Yuya DOKAI
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07766Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement
    • G06K19/07767Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card comprising at least a second communication arrangement in addition to a first non-contact communication arrangement the first and second communication means being two different antennas types, e.g. dipole and coil type, or two antennas of the same kind but operating at different frequencies
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773Antenna details
    • G06K19/07777Antenna details the antenna being of the inductive type
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773Antenna details
    • G06K19/07777Antenna details the antenna being of the inductive type
    • G06K19/07779Antenna details the antenna being of the inductive type the inductive antenna being a coil
    • G06K19/07783Antenna details the antenna being of the inductive type the inductive antenna being a coil the coil being planar
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773Antenna details
    • G06K19/07786Antenna details the antenna being of the HF type, such as a dipole
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/36Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06QDATA PROCESSING SYSTEMS OR METHODS, SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL, SUPERVISORY OR FORECASTING PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q20/00Payment architectures, schemes or protocols
    • G06Q20/30Payment architectures, schemes or protocols characterised by the use of specific devices
    • G06Q20/34Payment architectures, schemes or protocols characterised by the use of specific devices using cards, e.g. integrated circuit [IC] cards or magnetic cards
    • G06Q20/341Active cards, i.e. cards including their own processing means, e.g. including an IC or chip

Abstract

A wireless IC device includes a wireless IC element, a power supply circuit substrate including a laminate of a plurality of base layers and a power supply circuit connected to the wireless IC element, and a radiating element connected to the power supply circuit. The power supply circuit includes a first coil element connected in series with the wireless IC element, and a second coil element connected in parallel with the wireless IC element. The first coil element and the second coil element are wound and arranged such that winding axes of the first and second coil elements coincide or substantially coincide with each other and directions of magnetic fields generated in the respective first and second coil elements are opposite to each other.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a wireless IC device, and particularly relates to a wireless IC device preferably for use in an RFID (Radio Frequency Identification) system.

2. Description of the Related Art

In recent years, an RFID system has been put into practical use as an article information management system, which includes: a reader/writer that generates an induction field; and an RFID tag (also referred to as a wireless IC device) that is attached to an article, and non-contact communication using the induction field is established between the reader/writer and the RFID tag to transmit predetermined information therebetween. The RFID tag is composed of a wireless IC chip that has stored predetermined information therein and processes a predetermined wireless signal; and an antenna that performs transmission/reception of high-frequency signals. The RFID tag is attached to various articles as management objects (or their packing materials) when used.

As RFID systems, a HF-band RFID system using the 13 MHz band and a UHF-band RFID system using the 900 MHz band are typically known. Particularly, with the UHF-band RFID system, the communication distance is relatively long (the communication area is relatively wide), and it is possible to collectively perform reading/writing of a plurality of tags. Thus, the UHF-band RFID system is regarded as a promising system for article management.

As wireless IC devices for use in the UHF-band RFID system, for example, Japanese Patent Nos. 4069958 and 4561932 describe wireless IC devices in which a power supply circuit substrate is interposed between a wireless IC element (wireless IC chip) and an antenna element. In these wireless IC devices, the frequencies of transmission/reception signals are practically determined by a power supply circuit provided on the power supply circuit substrate. Thus, it is possible to easily realize stable high-frequency characteristics without being greatly influenced by the size of the antenna element (radiating plate) and the surface area of its periphery.

However, in each wireless IC device described above, when it is attempted to expand its frequency band, the power supply circuit becomes complicated, some coil elements and capacitor elements have to be incorporated thereinto, and the necessity to ensure isolation between these elements occurs. Thus, there is a problem that the size of the power supply circuit substrate is increased.

SUMMARY OF THE INVENTION

Preferred embodiments of the present invention provide a wireless IC device that allows a wide frequency band to be realized with a small-size power supply circuit substrate.

A wireless IC device according to an aspect of a preferred embodiment of the present invention includes a wireless IC element, a power supply circuit substrate including a laminate defined by laminated base layers, the power supply circuit substrate including a power supply circuit connected to the wireless IC element, and a radiating element connected to the power supply circuit. The power supply circuit includes a first coil element connected in series with the wireless IC element, and a second coil element connected in parallel with the wireless IC element. The first coil element and the second coil element are wound and arranged such that winding axes of the first and second coil elements coincide or substantially coincide with each other and directions of magnetic fields generated in the respective first and second coil elements are opposite to each other.

In the wireless IC device, since the first coil element and the second coil element are wound and arranged such that the winding axes of the first and second coil elements coincide or substantially coincide with each other and the directions of the magnetic fields generated in the respective first and second coil elements are opposite to each other, coupling between each coil element is excellent, a plurality of resonance points occurs, and transmission/reception of high-frequency signals is possible in a wide frequency band. In addition, since the number of elements is small, the size of the power supply circuit substrate is reduced, and the size of the wireless IC device itself is also reduced.

According to various preferred embodiments of the present invention, it is possible to realize a wide frequency band with a small-size power supply circuit substrate.

The above and other elements, features, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments with reference to the attached drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a cross-sectional view of a wireless IC device according to a first preferred embodiment of the present invention.

FIG. 1B is a plan view of the wireless IC device of FIG. 1A.

FIG. 1C is a plan view of the wireless IC device in a state where a power-supply module is removed.

FIG. 2 is a schematic diagram showing the internal configuration of a power supply circuit substrate constituting the wireless IC device.

FIG. 3 is an equivalent circuit diagram of the wireless IC device.

FIG. 4 is a plan view showing a lamination structure of the power supply circuit substrate in an exploded manner.

FIG. 5 is a graph showing a communication distance of the wireless IC device with respect to frequency.

FIG. 6A is a plan view of a wireless IC device according to a second preferred embodiment of the present invention.

FIG. 6B is a plan view of the wireless IC device in a state where a power-supply module is removed.

FIG. 7 is a Smith chart showing impedance characteristics of the wireless IC device according to the second preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, preferred embodiments of a wireless IC device according to the present invention will be described with reference to the accompanying drawings. It should be noted that in each drawing, common elements and portions are denoted by the same reference numerals, and the overlap description is omitted.

First Preferred Embodiment

A wireless IC device 1A according to a first preferred embodiment that is preferably used for communication in the UHF band. As shown in FIGS. 1A to 1C, the wireless IC device 1A includes a base sheet 10 having flexibility and a rectangular or substantially rectangular shape, a radiating element 20 preferably including two radiating portions 21A and 21B and connection portions 22A and 22B thereof, provided on a surface of the base sheet 10, and a power-supply module 30 connected to the radiating element 20, and is configured as a so-called RFID tag.

The base sheet 10 preferably has, for example, heat resistance or chemical resistance, and a thermoplastic resin material such as polyimide or PET may be used for the base sheet 10. The radiating element 20 preferably has flexibility as a metal film which is provided substantially on the entirety of the surface of the base sheet 10 and contains silver, copper, aluminum, or the like as a principal component. The radiating element 20 is divided into the two radiating portions 21A and 21B across a gap at a center portion thereof in a longitudinal direction, and the respective connection portions 22A and 22B are provided so as to face the gap across which the radiating portions 21A and 21B face each other. The power-supply module 30 is joined to the connection portions 22A and 22B preferably by a conductive joining material 39 such as solder so as to extend over the gap. In other words, the radiating element 20 serves as a dipole type radiating element. It should be noted that the radiating element 20 except for the connection portions 22A and 22B may be coated with a resist layer (e.g., a polyimide resin) which is not shown.

The power-supply module 30 includes a power supply circuit substrate 31 and a wireless IC element (wireless IC chip 50). The wireless IC chip 50 preferably includes a memory circuit, a clock circuit, a logic circuit, etc. and is an integrated circuit element which processes an RF signal. As shown in FIG. 2, the wireless IC chip 50 includes differential input/output electrodes 51A and 51B. The wireless IC chip 50 preferably includes a base defined by, for example, a semiconductor substrate such as silicon. It should be noted that the wireless IC element may be a bare chip IC or a package IC, for example.

A later-described power supply circuit 33 is included in the power supply circuit substrate 31, and is electrically and directly connected (DC-connected) to end portions of the radiating element 20, namely, the connection portions 22A and 22B, which are power-supply portions, by the conductive joining material 39 such as solder, for example. Specifically, in the power-supply module 30, the wireless IC chip 50 is mounted on the power supply circuit substrate 31 and is sealed by a resin material 55.

The power supply circuit substrate 31 preferably includes a laminate 32 including a plurality of base layers (see FIG. 4) laminated on each other, and includes the power supply circuit 33 shown in FIGS. 2 and 3. The power supply circuit 33 includes a first coil element L1 connected in series with the wireless IC chip 50; and a second coil element L2 connected in parallel with the wireless IC chip 50. An end of the first coil element L1 is connected to an electrode 34A, and the electrode 34A is connected to the input/output electrode 51A of the wireless IC chip 50 via a conductive joining material 52 such as solder. Another end of the first coil element L1 is connected to an input/output electrode 35A via a capacitor element C1, and the input/output electrode 35A is connected to the connection portion 22A of the radiating portion 21A via the conductive joining material 39.

An end of the second coil element L2 is connected to the other end of the first coil element L1 and the capacitor element C1. Another end of the second coil element L2 is connected to an electrode 34B, and the electrode 34B is joined to the input/output electrode 51B of the wireless IC chip 50 via the conductive joining material 52. Furthermore, the other end of the second coil element L2 is connected to an input/output electrode 35B via a capacitor element C2, and the input/output electrode 35B is connected to the connection portion 22B of the radiating portion 21B via the conductive joining material 39. In other words, the first coil element L1 is connected in series with a differential signal line, and the second coil element L2 is provided between differential signal lines.

The first coil element L1 and the second coil element L2 are wound and arranged such that the winding axes of the respective coil elements L1 and L2 coincide or substantially coincide with each other and the directions of magnetic fields M1 and M2 generated in the respective coil elements L1 and L2 are opposite to each other. Specifically, the coil elements L1 and L2 are arranged within the laminate 32 such that the winding axes thereof extend along the lamination direction of the laminate 32. In other words, as shown in FIG. 2, the direction of the magnetic field M1 generated by a current a in the first coil element L1 and the direction of the magnetic field M2 generated by a current b in the second coil element L2 are opposed to each other. The first coil element L1 and the second coil element L2 are magnetically coupled to each other as indicated by a reference character M, and the capacitor elements C1 and C2 define a resonant circuit. The resonant circuit also serves as an impedance matching circuit for the wireless IC chip 50 and the radiating element 20.

The first coil element L1 is a series inductance component on the wireless IC chip 50 side, and this inductance component mainly has a function to shift an impedance in the direction of an imaginary number axis on an impedance chart. Meanwhile, the second coil element L2 is a series inductance component on the radiating element 20 side, is arranged so as to extend over the two connection portions 22A and 22B of the radiating element 20, and mainly has a function to shift an impedance on an imaginary number axis on an admittance chart. As described above, since the two types of the coil elements are caused to have the respective functions as described above, it is possible to provide efficient impedance matching.

Here, the lamination structure of the power supply circuit substrate 31 (the laminate 32) will be described with reference to FIG. 4. The laminate 32 is preferably formed by laminating, pressure-bonding, and firing base layers 41 a to 41 l formed from a dielectric material or a magnetic material. It should be noted that the base layers constituting the laminate 32 are not limited to a ceramic material, and may be, for example, a thermosetting resin such as a liquid crystal polymer, or a resin such as a thermoplastic resin.

The base layers 41 a to 41 l are laminated such that the base layer 41 a becomes a lowermost layer and the base layer 41 l becomes an uppermost layer. The input/output electrodes 35A and 35B are formed on a back surface of the base layer 41 a, and via-hole conductors 61 a and 61 b are also formed therein. Capacitor electrodes 42A, 42B, 43A, 43B, 44A, and 44B are formed on front surfaces of the base layers 41 b, 41 c, and 41 d, and via-hole conductors 62 a, 62 b, 63 a, and 63 b are also formed therein. The via-hole conductors 63 a and 63 b are formed in the base layer 41 e. Conductor lines 45A to 45F are formed on front surfaces of the base layers 41 f to 41 k, and the via-hole conductors 63 a to 63 h are also formed therein. The input/output electrodes 34A and 34B and mounting electrodes 34C and 34D are formed on a front surface of the base layer 41 l, and the via-hole conductors 63 g and 63 h are also formed therein.

The power supply circuit 33 is preferably formed by laminating the base layers 41 a to 41 l described above. In other words, the electrodes 35A and 35B are connected to the capacitor electrodes 42A and 42B via the via-hole conductors 61 a and 61 b, respectively. The capacitor electrodes 42A and 42B are connected to the capacitor electrodes 44A and 44B via the via-hole conductors 62 a and 62 b, respectively. The capacitor electrodes 44A and 44B are connected to an end and another end of the conductor line 45A via the via-hole conductors 63 a and 63 b, respectively. The capacitor electrodes 43A and 43B are connected to the end and the other end of the conductor line 45A via the via-hole conductors 63 a and 63 b, respectively.

The end of the conductor line 45A is connected to an end of the conductor line 45B via the via-hole conductor 63 a, and another end of the conductor line 45B is connected to an end of the conductor line 45C via the via-hole conductor 63 d. The other end of the conductor line 45A is connected to an end of the conductor line 45F via the via-hole conductor 63 c, and another end of the conductor line 45F is connected to the input/output electrode 34B via the via-hole conductor 63 h. The conductor lines 45C, 45D, and 45E are connected to each other via the via-hole conductors 63 e and 63 f in a spiral manner. Another end of the conductor line 45E is connected to the input/output electrode 34A via the via-hole conductor 63 g.

With the connection mode described above, the capacitor electrodes 42A, 43A, and 44A constitute the capacitor element C1, and the capacitor electrodes 42B, 43B, and 43C constitute the capacitor element C2. In addition, the conductor lines 45C, 45D, and 45E constitute the first coil element L1, and the conductor line 45A constitutes the second coil element L2.

In the wireless IC device 1A, when a predetermined high-frequency signal is transmitted from the wireless IC chip 50 via the power supply circuit 33 to the radiating element 20, the high-frequency signal is radiated from the radiating element 20 to the outside without any change. Also, when the radiating element 20 receives a high-frequency wave from the outside, power is similarly supplied to the wireless IC chip 50 via the power supply circuit 33. Thus, the wireless IC chip 50 and a reader/writer, which is not shown, communicate with each other.

In the wireless IC device 1A, the first coil element L1 and the second coil element L2 are wound and arranged such that the winding axes of the coil elements L1 and L2 coincide or substantially coincide with each other and the directions of the magnetic fields M1 and M2 generated in the respective coil elements L1 and L2 are opposite to each other. Thus, coupling between the coil elements L1 and L2 is excellent, a plurality of resonance points occurs, and transmission/reception of high-frequency signals is possible in a wide frequency band. In addition, since the number of elements is small, the size of the power supply circuit substrate 31 is reduced, and the size of the wireless IC device 1A itself is also reduced.

With regard to the wireless IC device 1A using the power supply circuit substrate 31, its communication distance with respect to frequency is shown in FIG. 5. In FIG. 5, the communication distance is shown as a ratio in which the longest distance is regarded as 1. The actual distance depends on the gain of the radiating element 20. In addition, a region in which impedance matching is provided between the radiating element 20 and the wireless IC chip 50 is made large, and two resonance points X and Y (see FIG. 5) occur.

In the power supply circuit 33, the first coil element L1 mainly serves as an inductance element for impedance matching, and the second coil element L2 mainly serves as an inductance element constituting the power supply circuit 33. The impedance of the imaginary part of the wireless IC chip 50 is high in the negative direction, and the impedance of the imaginary part of the radiating element 20 is high in the positive direction. Thus, the inductance value of the first coil element L1 is preferably greater than the inductance value of the second coil element L2. In addition, the ratio L1:L2 of the inductance values of the first and second coil elements L1 and L2 is preferably about 3:1 to about 4:1, for example.

Second Preferred Embodiment

In a wireless IC device 1B according to a second preferred embodiment of the present invention, as shown in FIG. 6, the two radiating portions 21A and 21B of the radiating element 20 preferably have a meander shape, and the other configuration is preferably the same or substantially the same as that of the first preferred embodiment. The advantageous effects of the wireless IC device 1B are the same as those of the first preferred embodiment.

The communication distance of the wireless IC device 1B with respect to frequency shows substantially the same characteristics as in FIG. 5, and the gain is increased since the radiating portions 21A and 21B preferably have a meander shape. Thus, the communication distance is slightly lengthened. In addition, impedance characteristics are shown in FIG. 7. In FIG. 7, an A part is a characteristic at 860 MHz, and a B part is a characteristic at 960 MHz. Since a C part is ring-shaped, a region in which impedance matching is provided between the radiating element 20 and the wireless IC chip 50 is made large.

The impedance (imaginary part) of the wireless IC chip 50 preferably is about −150Ω to about −250Ω, and the impedance (imaginary part) of the radiating element 20 preferably is about 50 to about 400Ω, for example.

It should be noted that the wireless IC device according to the present invention is not limited to the preferred embodiments described above, and can be variously modified within the scope of the present invention.

In particular, the materials, the shapes, and the sizes of the base sheet and the radiating element may be selected as appropriate according to the purpose. In addition, the shape of the radiating element is arbitrary, and may be a loop shape.

In addition, it is possible to use the wireless IC device not only as a tag attached to an article but also as a reader/writer, and it is also possible to use the wireless IC device in a wireless communication system other than an RFID system. Moreover, the wireless IC chip may be mounted on another substrate, other than being mounted on the power supply circuit substrate.

Other than being provided exclusively, the radiating element may be configured using a ground conductor provided on a printed wiring board. In this case, the printed wiring board preferably is a body of the wireless IC device. In addition, the power supply circuit substrate may be formed by a so-called semiconductor process as a rewiring layer of the wireless IC chip, for example.

As described above, preferred embodiments of the present invention are useful for a wireless IC device, and are particularly excellent in that it is possible to realize a wide frequency band with a small-size power supply circuit substrate.

While preferred embodiments of the present invention have been described above, it is to be understood that variations and modifications will be apparent to those skilled in the art without departing from the scope and spirit of the present invention. The scope of the present invention, therefore, is to be determined solely by the following claims.

Claims (14)

What is claimed is:
1. A wireless IC device comprising:
a wireless IC element;
a power supply circuit substrate including a laminate of a plurality of base layers, and a power supply circuit connected to the wireless IC element; and
a radiating element connected to the power supply circuit; wherein
the power supply circuit includes a first coil element connected in series with the wireless IC element, and a second coil element connected in parallel with the wireless IC element; and
the first coil element and the second coil element are wound and arranged such that winding axes of the first and second coil elements coincide or substantially coincide with each other and directions of magnetic fields generated in the respective first and second coil elements are opposite to each other.
2. The wireless IC device according to claim 1, wherein the first coil element and the second coil element are arranged within the laminate such that the winding axis of each coil element extends along a lamination direction of the base layers.
3. The wireless IC device according to claim 1, wherein
the power supply circuit includes a first capacitor element and a second capacitor element which are connected between both end portions of the second coil element and the radiating element; and
the second coil element and the first and second capacitor elements constitute a resonant circuit.
4. The wireless IC device according to claim 1, wherein the radiating element includes two radiating portions and connection portions.
5. The wireless IC device according to claim 4, wherein the two radiating portions are arranged to face each other across a gap at a center portion thereof in a longitudinal direction, and the connection portions are arranged to face the gap across which the radiating portions face each other.
6. The wireless IC device according to claim 1, wherein the radiating element includes a flexible metal film.
7. The wireless IC device according to claim 1, wherein the radiating element is a dipole radiating element.
8. The wireless IC device according to claim 1, further comprising a resin material arranged to cover the wireless IC element mounted on the power supply circuit substrate.
9. The wireless IC device according to claim 1, wherein the first coil element is a series inductance component on a side of the wireless IC device and the second coil element is a series inductance component on a side of the radiating element.
10. The wireless IC device according to claim 1, wherein a ratio of inductance values of the first and second coil elements is about 3:1 or about 4:1.
11. The wireless IC device according to claim 1, wherein the two radiating portions have a meander shape.
12. A wireless communication system comprising the wireless IC device according to claim 1.
13. A reader/writer apparatus comprising the wireless IC device according to claim 1.
14. An RFID device comprising the wireless IC device according to claim 1.
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